Los diques alcalinos de pórfidos monzo-sieníticos del Sistema Central Español: relación con los diques lamprofídicos acompañantes

Abstract

The alkaline monzo-syenitic porphyries from the Spanish Central System (SCS) show a heterogeneous composition ranging from basic to acid terms which give rise to major and trace element compositional trends in accordance with fractional crystallization of amphibole, plagioclase, biotite, alkaline feldspar, Timagnetite and apatite. The whole-rock geochemistry of the basic porphyries shows clear similarities with respect to the SCS isotopically enriched alkaline lamprophyres, indicating that a genetic link between both groups of dykes might exist. This relationship would probably represent an origin of the monzo-syenitic porphyries after differentiation of parental lamprophyric magmas due to fractional crystallization